Package com.sun.el

Class MethodExpressionLiteral

  • All Implemented Interfaces:
    java.io.Externalizable, java.io.Serializable

    public class MethodExpressionLiteral
    extends MethodExpression
    implements java.io.Externalizable
    See Also:
    Serialized Form
    • Field Summary

      Fields 
      Modifier and Type Field Description
      private java.lang.Class expectedType  
      private java.lang.String expr  
      private java.lang.Class[] paramTypes  
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean equals​(java.lang.Object obj)
      Determines whether the specified object is equal to this Expression.
      java.lang.String getExpressionString()
      Returns the original String used to create this Expression, unmodified.
      MethodInfo getMethodInfo​(ELContext context)
      Evaluates the expression relative to the provided context, and returns information about the actual referenced method.
      int hashCode()
      Returns the hash code for this Expression.
      java.lang.Object invoke​(ELContext context, java.lang.Object[] params)
      If a String literal is specified as the expression, returns the String literal coerced to the expected return type of the method signature.
      boolean isLiteralText()
      Returns whether this expression was created from only literal text.
      void readExternal​(java.io.ObjectInput in)  
      void writeExternal​(java.io.ObjectOutput out)  
      • Methods inherited from class java.lang.Object

        clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • expectedType

        private java.lang.Class expectedType
      • expr

        private java.lang.String expr
      • paramTypes

        private java.lang.Class[] paramTypes
    • Constructor Detail

      • MethodExpressionLiteral

        public MethodExpressionLiteral()
      • MethodExpressionLiteral

        public MethodExpressionLiteral​(java.lang.String expr,
                                       java.lang.Class expectedType,
                                       java.lang.Class[] paramTypes)
    • Method Detail

      • getMethodInfo

        public MethodInfo getMethodInfo​(ELContext context)
                                 throws ELException
        Description copied from class: MethodExpression
        Evaluates the expression relative to the provided context, and returns information about the actual referenced method.
        Specified by:
        getMethodInfo in class MethodExpression
        Parameters:
        context - The context of this evaluation
        Returns:
        an instance of MethodInfo containing information about the method the expression evaluated to.
        Throws:
        PropertyNotFoundException - if one of the property resolutions failed because a specified variable or property does not exist or is not readable.
        MethodNotFoundException - if no suitable method can be found.
        ELException - if an exception was thrown while performing property or variable resolution. The thrown exception must be included as the cause property of this exception, if available.
      • invoke

        public java.lang.Object invoke​(ELContext context,
                                       java.lang.Object[] params)
                                throws ELException
        Description copied from class: MethodExpression
        If a String literal is specified as the expression, returns the String literal coerced to the expected return type of the method signature. An ELException is thrown if expectedReturnType is void or if the coercion of the String literal to the expectedReturnType yields an error (see Section "1.18 Type Conversion" of the EL specification). If not a String literal, evaluates the expression relative to the provided context, invokes the method that was found using the supplied parameters, and returns the result of the method invocation. Any parameters passed to this method is ignored if isLiteralText() or isParmetersProvided() is true.
        Specified by:
        invoke in class MethodExpression
        Parameters:
        context - The context of this evaluation.
        params - The parameters to pass to the method, or null if no parameters.
        Returns:
        the result of the method invocation (null if the method has a void return type).
        Throws:
        PropertyNotFoundException - if one of the property resolutions failed because a specified variable or property does not exist or is not readable.
        MethodNotFoundException - if no suitable method can be found.
        ELException - if a String literal is specified and expectedReturnType of the MethodExpression is void or if the coercion of the String literal to the expectedReturnType yields an error (see Section "1.18 Type Conversion").
      • getExpressionString

        public java.lang.String getExpressionString()
        Description copied from class: Expression
        Returns the original String used to create this Expression, unmodified.

        This is used for debugging purposes but also for the purposes of comparison (e.g. to ensure the expression in a configuration file has not changed).

        This method does not provide sufficient information to re-create an expression. Two different expressions can have exactly the same expression string but different function mappings. Serialization should be used to save and restore the state of an Expression.

        Specified by:
        getExpressionString in class Expression
        Returns:
        The original expression String.
      • equals

        public boolean equals​(java.lang.Object obj)
        Description copied from class: Expression
        Determines whether the specified object is equal to this Expression.

        The result is true if and only if the argument is not null, is an Expression object that is the of the same type (ValueExpression or MethodExpression), and has an identical parsed representation.

        Note that two expressions can be equal if their expression Strings are different. For example, ${fn1:foo()} and ${fn2:foo()} are equal if their corresponding FunctionMappers mapped fn1:foo and fn2:foo to the same method.

        Specified by:
        equals in class Expression
        Parameters:
        obj - the Object to test for equality.
        Returns:
        true if obj equals this Expression; false otherwise.
        See Also:
        Hashtable, Object.equals(java.lang.Object)
      • hashCode

        public int hashCode()
        Description copied from class: Expression
        Returns the hash code for this Expression.

        See the note in the Expression.equals(java.lang.Object) method on how two expressions can be equal if their expression Strings are different. Recall that if two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result. Implementations must take special note and implement hashCode correctly.

        Specified by:
        hashCode in class Expression
        Returns:
        The hash code for this Expression.
        See Also:
        Expression.equals(java.lang.Object), Hashtable, Object.hashCode()
      • isLiteralText

        public boolean isLiteralText()
        Description copied from class: Expression
        Returns whether this expression was created from only literal text.

        This method must return true if and only if the expression string this expression was created from contained no unescaped EL delimeters (${...} or #{...}).

        Specified by:
        isLiteralText in class Expression
        Returns:
        true if this expression was created from only literal text; false otherwise.
      • readExternal

        public void readExternal​(java.io.ObjectInput in)
                          throws java.io.IOException,
                                 java.lang.ClassNotFoundException
        Specified by:
        readExternal in interface java.io.Externalizable
        Throws:
        java.io.IOException
        java.lang.ClassNotFoundException
      • writeExternal

        public void writeExternal​(java.io.ObjectOutput out)
                           throws java.io.IOException
        Specified by:
        writeExternal in interface java.io.Externalizable
        Throws:
        java.io.IOException